1676: Sir John Wynn, 5th Baronet of Gwydir and Rhiwgoch and Wynnstay, Denbighshire.
His direct ancestors, the Williams family, were an important parliamentary and landowning family from Denbighshire, north Wales, who in the 17th Century married into the famous Wynn family of Gwydir, the direct patrilineal descendants of Owain Gwynedd, Prince of Gwynedd 1137–1170, and the only surviving branch of that dynasty.
On the death of Sir John Wynn in 1719, his heiress Jane Thelwall inherited both the Wynnstay estate and the Wynn claim to Aberffraw.
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He succeeded his cousin Sir Richard Wynn, 4th Baronet as a baronet in 1674 but did not inherit the Gwydyr Estate, which passed to his predecessor's daughter Mary.
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The current baronet is Sir David Watkin Williams-Wynn, 11th Baronet (born 1940).
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On his death the Wynn baronetcy became extinct and the ancient House of Aberffraw (which claimed direct descent from Rhodri Mawr ap Merfyn in the late 9th century and through him to the legendary line of Brutus) was left without known male issue.
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Had Thomas Jones (Twm Siôn Cati) really been the illegitimate son of John "Wynn" ap Maredudd (as claimed by Sir John Wynn, 1st Baronet in his family history), his children would have been next in line, illegitimate sons having the same rights of inheritance as legitimate ones under ancient Welsh law.